单纯疱疹病毒1功能性基因在角膜内潜伏感染的实验研究

目的 研究角膜中是否有单纯疱疹病毒１型功能性基因的潜伏。方法 在新西兰白兔角膜上制作典型的单纯疱疹病毒１型引发的角膜炎模型,然后将进入稳定期的病变角膜移植到健康兔眼上,术后２周取下植片。每下植片标本均分为三部分,一部分角膜片先行ＨＳＶ－１抗原检测,另一部分采用多聚酶链反应技术检测ＨＳＶ－１潜伏相关转录、胸苷激酶和ＤＮＡ聚合酶基因,第三部分经器官培养３周后,再与兔原代肾细胞一起培养１周,再检测培养后     

永存原始玻璃体增生症与先天性纤维血管瞳孔膜临床特征的比较

目的：分析永存原始玻璃体增生症(PHPV)和先天性纤维血管瞳孔膜(CFPM)的临床特征异同。

方法：回顾性分析2006-03/2021-12在空军军医大学西京医院眼科接受手术治疗的PHPV(PHPV组)和CFPM患儿(CFPM组)的眼部生物测量参数、临床表现、病变的形态学特点。

结果：纳入PHPV患儿56例61眼,CFPM患儿24例25眼; PHPV和CFPM的发病年龄相似、无性别差异,均以单眼患病为主,其占比分别为91%和96%。PHPV合并白内障患眼可有多种并发症和眼发育异常,CFPM主要为不同程度的瞳孔区堵塞及形态异常。PHPV组和CFPM组单眼患病患儿患眼前房深度(ACD)均小于对侧眼,手术年龄≤24月龄患儿患眼眼轴长度(AL)均小于对侧眼(P<0.05); PHPV组单眼患病患儿患眼角膜直径(CD)小于对侧眼、眼压高于对侧眼(均P<0.05); CFPM组单眼患病患儿患眼与对侧眼CD、IOP比较均无显著差异(P>0.05)。PHPV组患儿患眼ACD小于CFPM组患眼(P<0.05)。术中发现PHPV纤维血管膜组织位于晶状体后、玻璃体腔内,而CFPM纤维血管膜位于虹膜与晶状体前囊膜之间,很少累及晶状体。

结论：PHPV和CFPM有非常相似的临床特点,提示PHPV和CFPM可能是永存胚胎血管(PFV)的不同表现形式,但PHPV病变范围更广、病情更复杂。     

穿透性角膜移植术128例临床分析

目的评价穿透性角膜移植术治疗角膜疾病的疗效。方法对128例(128眼)角膜混浊病人行穿透性角膜移植术,于术后1月、3月、6月、12月、24月观察角膜的透明情况以及并发症。结果穿透性角膜移植术后1月128眼中82眼透明(64.1%),术后6月90眼中69眼透明(76.7%),术后12月84眼中53眼透明(63.1%),术后24月43眼中27眼透明(62.8%)。以此同时,患者的视力均有不同程度的增加,术后1月角膜透明82眼中有67眼矫正视力大于0.1(82%),术后3月63眼中有59眼矫正视力大于0.1(94%)同,术后6月69眼中有66眼矫正视力大于0.1(96%)。结论穿透性角膜移植术是治疗因角膜病致盲患者的重要手段,排斥反应是术后主要并发症,三联手术安全有效。     

阿魏酸钠对大鼠角膜新生血管的抑制作用研究

目的 探讨阿魏酸钠(SF)对角膜新生血管(CNV)的抑制作用及其机制.方法 将不同质量浓度的SF用于缝线诱导的大鼠CNV模型,观察其抑制CNV形成的效果,采用免疫组织化学法和RT-PCR法检测血管内皮生长因子(VEGF)蛋白和mRNA在角膜组织中的表达水平.结果 0.025%和0.1%SF治疗组CNV面积均小于阴性对照组,以后者更明显,差异均有统计学意义(P＜0.05),0.1%SF治疗组与阳性对照组间差异无统计学意义(P＞0.05);免疫组织化学显示VEGF在正常角膜不表达或在上皮基底细胞有弱表达,阴性对照组染色明显增强,0.1%SF治疗组表达明显减弱;VEGFmRNA和蛋白水平表达有一致性.结论 SF滴眼液能有效地抑制CNV的生长,其抑制VEGF的表达可能是SF抑制CNV生成的一个重要机制.     

氧化应激条件下miR-21对人眼小梁网细胞胞外基质蛋白表达的影响

目的 探讨氧化应激条件下miR-21对人眼小梁网细胞(human trabecular meshwork cells,HTMCs)胞外基质蛋白表达的影响.方法 用不同浓度H2O2(0μmol·L-1、200 μmol·L-1、400 μmol·L-1、600 μmol·L-1)刺激HTMCs l h,MTT法检测其对HTMCs活力的影响,从而确定后续实验所需H2O2浓度.随后将细胞分成正常组和H2O2组,Real-time PCR检测miR-21的表达,Western blot检测胞外基质蛋白(纤维连接蛋白和胶原蛋白I)的表达.然后将细胞分成5组:H2O2组(只用H2O2处理)、miR-21干预组(H2O2+ miR-21模拟物)、miR-21对照组(H2O2+ miR-21对照模拟物)、miR-21抑制组(H2O2+ miR-21抑制剂)和miR-21抑制对照组(H2O2+miR-21抑制剂对照物),Real-time PCR检测miR-21、转化生长因子(transforming growth factor,TGF)-β2和PTEN mRNA表达,Western blot检测胞外基质蛋白、TGF-β2和PTEN蛋白表达.最后将细胞分成3组:H2O2组(只用H2O2处理)、PTEN干扰组(H2O2 +PTEN siRNA)和干扰对照组(H2O2+ control siRNA),检测PTEN、胞外基质蛋白和TGF-β2蛋白水平表达.结果 当H2O2浓度≥400 μmol·L-1时,可显著抑制HTMCs的活性,后续实验选择此浓度.与正常组相比,H2O2组中miR-21、纤维连接蛋白和胶原蛋白Ⅰ的表达均增加,差异均有统计学意义(均为P＜0.05).检测氧化应激条件下miR-21对胞外基质蛋白、TGF-β2和PTEN表达的影响,发现与H2 O2组相比,miR-21对照组和miR-21抑制对照组中miR-21、纤维连接蛋白与胶原蛋白Ⅰ蛋白水平表达以及TGF-β2和PTEN mRNA及蛋白水平表达差异均无统计学意义(均为P＞0.05);与miR-21对照组相比,miR-21干预组miR-21、纤维连接蛋白和胶原蛋白Ⅰ蛋白水平及TGF-β2 mRNA和蛋白水平表达均增加,PTEN蛋白水平表达降低,差异均有统计学意义(均为P＜0.05),而PTEN mRNA表达差异均无统计学意义(均为P＞0.05);与miR-21抑制对照组相比,miR-21抑制组miR-21、纤维连接蛋白和胶原蛋白Ⅰ蛋白水平及TGF-β2 mRNA和蛋白水平表达均降低,PTEN蛋白水平表达增加,差异均有统计学意义(均为P＜O.05),而PTEN mRNA水平差异无统计学意义(P＞0.05).采用Western blot检测氧化应激条件下PTEN对TGF-β2和胞外基质蛋白表达的影响,发现与H2O2组相比,干扰对照组PTEN、TGF-β2、纤维连接蛋白和胶原蛋白Ⅰ的表达差异均无统计学意义(均为P＞0.05);与干扰对照组相比,PTEN干扰组PTEN的表达下调,TGF-β2、纤维连接蛋白和胶原蛋白Ⅰ的表达均升高,差异均有统计学意义(均为P＜0.05).结论 氧化应激条件下miR-21可增加HTMCs胞外基质产物,这可能与其靶向沉默PTEN基因,调节TGF-β2的表达相关.     

Association of Gut Microbiota Enterotypes with Blood Trace Elements in Women with Infertility

Infertility is defined as failure to achieve pregnancy within 12 months of unprotected intercourse in women. Trace elements, a kind of micronutrient that is very important to female reproductive function, are affected by intestinal absorption, which is regulated by gut microbiota. Enterotype is the classification of an intestinal microbiome based on its characteristics. Whether or not Prevotella-enterotype and Bacteroides-enterotype are associated with blood trace elements among infertile women remains unclear. The study aimed to explore the relationship between five main whole blood trace elements and these two enterotypes in women with infertility. This retrospective cross-sectional study recruited 651 Chinese women. Whole blood copper, zinc, calcium, magnesium, and iron levels were measured. Quantitative real-time PCR was performed on all fecal samples. Patients were categorized according to whole blood trace elements (low levels group, <5th percentile; normal levels group, 5th‒95th percentile; high levels group, >95th percentile). There were no significant differences in trace elements between the two enterotypes within the control population, while in infertile participants, copper (P = 0.033), zinc (P < 0.001), magnesium (P < 0.001), and iron (P < 0.001) in Prevotella-enterotype was significantly lower than in Bacteroides-enterotype. The Chi-square test showed that only the iron group had a significant difference in the two enterotypes (P = 0.001). Among infertile patients, Prevotella-enterotype (Log(P/B) > −0.27) predicted the low levels of whole blood iron in the obesity population (AUC = 0.894; P = 0.042). For the high levels of iron, Bacteroides-enterotype (Log(P/B) <−2.76) had a predictive power in the lean/normal group (AUC = 0.648; P = 0.041) and Log(P/B) <−3.99 in the overweight group (AUC = 0.863; P = 0.013). We can infer that these two enterotypes may have an effect on the iron metabolism in patients with infertility, highlighting the importance of further research into the interaction between enterotypes and trace elements in reproductive function.     

Elucidation of Anti-Hypertensive Mechanism by a Novel Lactobacillus rhamnosus AC1 Fermented Soymilk in the Deoxycorticosterone Acetate-Salt Hypertensive Rats

Dietary intake of fermented soymilk is associated with hypotensive effects, but the mechanisms involved have not been fully elucidated. We investigated the anti-hypertensive effects of soymilk fermented by L. rhamnosus AC1 on DOCA-salt hypertension from the point of view of oxidative stress, inflammatory response and alteration of the gut microbiome. The antioxidant assays in vitro indicated the ethanol extract (EE) of L. rhamnosus AC1 fermented soymilk showed better antioxidative effects than the water extract (WE). Those extracts displayed a hypotensive effect using a tail-cuff approach to measuring blood pressure and improved nitric oxide (NO), angiotensin II (Ang II), tumor necrosis factor-α (TNF-α) and interleukin factor-6 (IL-6) on DOCA-salt hypertensive rats. Furthermore, cardiac and renal fibrosis were attenuated by those extracts. The gut microbiota analysis revealed that they significantly reduced the abundance of phylum Proteobacteria, its family Enterobacteriaceae and genus Escherichia-Shigella. Moreover, metabolomic profiling revealed several potential gut microbiota-related metabolites which appeared to involve in the development and recovery of hypertension. In conclusion, fermented soymilk is a promising nutritional intervention strategy to improve hypertension via reducing inflammation and reverting dysbiotic microbiota.     

儿童特发性间质性肺疾病与肺表面活性物质-B基因多态性的相关性研究

目的 探讨肺表面活性物质(surfactant protein,SP)-B外显子4(T131I)位点的基因多态性与儿童特发性间质性肺疾病的相关性.方法 收集2013年10月至2016年9月在深圳市儿童医院和广西医科大学附属第一医院住院诊断为特发性间质性肺疾病的患儿共67例为病例组,选择同期与特发性间质性肺疾病无关的因呼吸道感染在深圳市儿童医院住院的102例患儿为对照组,采用SP-B全外显子和侧翼区高通量测序法对所有病例采集的标本进行检测,分析外显子4(T131I)位点的基因型和等位基因分布.结果 病例组和对照组SP-B基因外显子 4(T131I)位点的基因型均可检出3 种,CC、CT及TT型,病例组所占比例分别为67.16%、25.37%、7.46%,对照组分别为56.86%、35.29%、7.84%,两组基因型分布的差异无统计学意义(χ2=1.981,P=0.371);病例组C等位基因频率为79.85%,对照组为74.51%,差异无统计学意义(χ2=1.288,P=0.256).对照组SP-B基因外显子 4(T131I)位点的基因突变频率为43.14%(44/102),与人类基因组千人人群数据库基因突变频率平均值52.00%比较,差异无统计学意义(P>0.05);与欧洲千人人群数据库基因突变频率53.88%、南亚千人人群数据库基因突变频率45.50%和美洲整体人群数据库基因突变频率41.93%比较,差异无统计学意义(P>0.05),而与东亚千人人群数据库基因突变频率26.39%和非洲千人人群数据库基因突变频率80.18%比较,差异有统计学意义(P<0.05).结论 SP-B 基因外显子4(T131I)位点的基因多态性与儿童特发性间质性肺疾病易感性不存在相关性,外显子4(T131I)位点的基因突变频率与种族人群和地域具有一定的差异性.